I bought and downloaded Amber's Blood (a Carol Reed game) from Adventure Shop. All seemed to be going well, although it took a very long time to download; but now I can't find those two files and I don't know where to look for them.

I need the files so I can install the game - can't find any place to get help at Adventure Shop

If you used your browser... go to the download links and select one of them. You should see a menu that states "save as"... note the location it saves too, that's where you should find your files. Cancel the download at that point.

If you used a downloader, the files may have saved to your desktop. Enable View Desktop Icons to see if the folder is there.